Пользовательский список Listview не обновляется на фрагменте назад

Question

У меня есть один пользовательский интерфейс списка просмотра списка загрузки списка контактов. Когда я открываю приложение, контакты загружаются отлично, но как только я вернулся после прокрутки в Фрагмент предпочтений, listview пуст. Хотя данные собираются, вызывая Inner class LoadContact, но ничего в listview. Есть три фрагмента. PLS руководство. Код для фрагмента (tab1). Если вы видите, я добавил инициализацию адаптера в oncreatview, так как в противном случае на задней вкладке я получаю исключение Null point. Я исправился?

public class Requestor extends Fragment { 

    EditText targetdevice; 
    ListView recentlist; 
    List<String> recentlistarray = new ArrayList<>(); 
    ArrayAdapter arrayAdapter; 
    Dialog dialog; 
    String targetmobile, requesttype; 
    private TextView tex1, remotelocation; 
    int deviceid; 
    LinearLayout contactlayout; 
    RadioButton radiorecent, radiocontact; 

    ArrayList<ContactListSelectUser> contactListSelectUsers; 
    List<ContactListSelectUser> temp; 
    // Contact List 
    ListView listView; 

    // Cursor to load contacts list 
    Cursor phones, email; 

    // Pop up 
    ContentResolver resolver; 
    SearchView search; 
    ContactListAdapter adapter; 


    @Override 
    public void onActivityCreated(@Nullable Bundle savedInstanceState) { 
     super.onActivityCreated(savedInstanceState); 
     LoadContact loadContact = new LoadContact(); 
     loadContact.execute(); 
    } 

    @Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) throws NullPointerException{ 
     View view = inflater.inflate(R.layout.autolocationrequester, container, false); 

     targetdevice = (EditText) view.findViewById(R.id.targetdevice); 
     recentlist = (ListView) view.findViewById(R.id.targetlist); 
     remotelocation = (TextView) view.findViewById(R.id.remotelocationreq); 
     tex1 = (TextView) view.findViewById(R.id.tex1); 
     requesttype = "Location"; 
     radiorecent = (RadioButton) view.findViewById(R.id.radiorecent); 
     radiocontact = (RadioButton) view.findViewById(R.id.radiocontact); 
     contactlayout = (LinearLayout) view.findViewById(R.id.contactlayout); 
     tex1 = (TextView) view.findViewById(R.id.tex1); 
     recentlist.setVisibility(View.GONE); 
     contactlayout.setVisibility(View.GONE); 
     tex1.setVisibility(View.GONE); 

     contactListSelectUsers = new ArrayList<ContactListSelectUser>(); 
     resolver = getActivity().getApplicationContext().getContentResolver(); 
     listView = (ListView) view.findViewById(R.id.contacts_list); 
     adapter = new ContactListAdapter(contactListSelectUsers, getActivity().getApplicationContext()); 
     phones = getActivity().getApplicationContext().getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " ASC"); 


     LoadContact loadContact = new LoadContact(); 
     loadContact.execute(); 

     search = (SearchView) view.findViewById(R.id.searchView); 

     //*** setOnQueryTextListener *** 
     search.setOnQueryTextListener(new SearchView.OnQueryTextListener() { 

      @Override 
      public boolean onQueryTextSubmit(String query) { 
       // TODO Auto-generated method stub 

       return false; 
      } 

      @Override 
      public boolean onQueryTextChange(String newText) { 
       // TODO Auto-generated method stub 
       adapter.filter(newText); 
       return false; 
      } 

     }); 
     SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity().getApplicationContext()); 
     deviceid = Integer.parseInt(sharedPreferences.getString("deviceid", "")); 

     remotelocation.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       arrayAdapter = new ArrayAdapter(getActivity().getApplicationContext(), android.R.layout.simple_list_item_1, recentlistarray); 
       recentlist.setAdapter(arrayAdapter); 
       targetmobile = targetdevice.getText().toString(); 
       new sendreqloc().execute(); 
       targetdevice.setText(""); 

       // Popup.smallpopup("hi", getApplicationContext()); 
      } 
     }); 

     radiorecent.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       recentlist.setVisibility(View.VISIBLE); 
       tex1.setVisibility(View.VISIBLE); 
       contactlayout.setVisibility(View.GONE); 
       targetdevice.setText(""); 
      } 
     }); 


     radiocontact.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       recentlist.setVisibility(View.GONE); 
       contactlayout.setVisibility(View.VISIBLE); 
       tex1.setVisibility(View.GONE); 
       targetdevice.setText(""); 
       LoadContact loadContact = new LoadContact(); 
       loadContact.execute(); 

      } 
     }); 

     return view; 
    } 


    public class LoadContact extends AsyncTask<Void, Void, Void> { 
     @Override 
     protected void onPreExecute() { 

      super.onPreExecute(); 

     } 

     @Override 
     protected Void doInBackground(Void... voids) { 
      // Get Contact list from Phone 

      if (phones != null) { 
       Log.e("count", "" + phones.getCount()); 
       if (phones.getCount() == 0) { 
        //  Toast.makeText(Requestor.this, "No contacts in your contact list.", Toast.LENGTH_LONG).show(); 
       } 

       while (phones.moveToNext()) { 
        Log.d("Contact Class Called",""); 
        Bitmap bit_thumb = null; 
        String id = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.CONTACT_ID)); 
        String name = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)); 
        String phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)); 
        // String EmailAddr = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA2)); 
        String image_thumb = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.PHOTO_THUMBNAIL_URI)); 
        try { 
         if (image_thumb != null) { 
          bit_thumb = MediaStore.Images.Media.getBitmap(resolver, Uri.parse(image_thumb)); 
         } else { 
          Log.e("No Image Thumb", "--------------"); 
         } 
        } catch (IOException e) { 
         e.printStackTrace(); 
        } 

        ContactListSelectUser contactListSelectUser = new ContactListSelectUser(); 
        contactListSelectUser.setThumb(bit_thumb); 
        contactListSelectUser.setName(name); 
        contactListSelectUser.setPhone(phoneNumber); 
        contactListSelectUser.setEmail(id); 
        // contactListSelectUser.setCheckedBox(false); 
        // if (!contactListSelectUsers.contains(contactListSelectUser.getPhone())) { 
        contactListSelectUsers.add(contactListSelectUser); 
        //} 

       } 
      } else { 
       Log.e("Cursor close 1", "----------------"); 
      } 
      //phones.close(); 
      //System.out.println(contactListSelectUsers.size()); 
      return null; 
     } 

     @Override 
     protected void onPostExecute(Void aVoid) { 
      super.onPostExecute(aVoid); 
      adapter = new ContactListAdapter(contactListSelectUsers, getActivity()); 
      listView.setAdapter(adapter); 

      // Select item on listclick 
      listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
       @Override 
       public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { 

        Log.e("search", "here---------------- listener"); 

        ContactListSelectUser data = contactListSelectUsers.get(i); 
        targetdevice.setText(data.getPhone()); 
       } 
      }); 

      listView.setFastScrollEnabled(true); 
     } 
    } 

    /* @Override 
    protected void onStop() { 
     super.onStop(); 
     phones.close(); 
    }*/ 
} 

код пользовательского класса адаптера:

public class ContactListAdapter extends BaseAdapter implements Filterable { 

     public List<ContactListSelectUser> _data; 


private ArrayList<ContactListSelectUser> arraylist; 
    Context _c; 
    ViewHolder v; 
    RoundImage roundedImage; 
    private Filter filter = new CustomFilter(); 

    public ContactListAdapter(List<ContactListSelectUser> contactListSelectUsers, Context context) { 
     _data = contactListSelectUsers; 
     _c = context; 
     this.arraylist = new ArrayList<ContactListSelectUser>(); 
     this.arraylist.addAll(_data); 
    } 

    @Override 
    public int getCount() { 
     return _data.size(); 
    } 

    @Override 
    public Object getItem(int i) { 
     return _data.get(i); 
    } 

    @Override 
    public long getItemId(int i) { 
     return i; 
    } 

    @TargetApi(Build.VERSION_CODES.LOLLIPOP) 
    @Override 
    public View getView(int i, View convertView, ViewGroup viewGroup) { 
     View view = convertView; 
     if (view == null) { 
      LayoutInflater li = (LayoutInflater) _c.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      view = li.inflate(R.layout.contact_info, null); 
      Log.e("Inside", "here--------------------------- In view1"); 
     } else { 
      view = convertView; 
      Log.e("Inside", "here--------------------------- In view2"); 
     } 

     v = new ViewHolder(); 

     v.title = (TextView) view.findViewById(R.id.name); 
     // v.check = (CheckBox) view.findViewById(R.id.check); 
     v.phone = (TextView) view.findViewById(R.id.no); 
     v.imageView = (ImageView) view.findViewById(R.id.pic); 

     final ContactListSelectUser data = (ContactListSelectUser) _data.get(i); 
     v.title.setText(data.getName()); 
     // v.check.setChecked(data.getCheckedBox()); 
     v.phone.setText(data.getPhone()); 

     // Set image if exists 
     try { 

      if (data.getThumb() != null) { 
       v.imageView.setImageBitmap(data.getThumb()); 
      } else { 
       v.imageView.setImageResource(R.mipmap.ic_launcher); 
      } 
      // Seting round image 
      Bitmap bm = BitmapFactory.decodeResource(view.getResources(), R.mipmap.ic_launcher); // Load default image 
      roundedImage = new RoundImage(bm); 
      v.imageView.setImageDrawable(roundedImage); 
     } catch (OutOfMemoryError e) { 
      // Add default picture 
      v.imageView.setImageDrawable(this._c.getDrawable(R.mipmap.ic_launcher)); 
      e.printStackTrace(); 
     } 

     Log.e("Image Thumb", "--------------" + data.getThumb()); 

     /*// Set check box listener android 
     v.check.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       CheckBox checkBox = (CheckBox) view; 
       if (checkBox.isChecked()) { 
        data.setCheckedBox(true); 
        } else { 
        data.setCheckedBox(false); 
       } 
      } 
     });*/ 

     view.setTag(data); 
     return view; 
    } 

    // Filter Class 
    public void filter(String charText) { 
     charText = charText.toLowerCase(Locale.getDefault()); 
     _data.clear(); 
     if (charText.length() == 0) { 
      _data.addAll(arraylist); 
     } else { 
      for (ContactListSelectUser wp : arraylist) { 
       if (wp.getName().toLowerCase(Locale.getDefault()) 
         .contains(charText)) { 
        _data.add(wp); 
       } 
      } 
     } 
     notifyDataSetChanged(); 
    } 

    @Override 
    public Filter getFilter() { 
     return filter; 
    } 

    static class ViewHolder { 
     ImageView imageView; 
     TextView title, phone; 
     CheckBox check; 
    } 

    private class CustomFilter extends Filter { 


     @Override 
     protected FilterResults performFiltering(CharSequence charSequence) { 
      _data.clear(); 

      FilterResults filterResults = new FilterResults(); 
      filterResults.values = _data; 
      filterResults.count = _data.size(); 
      return filterResults; 
     } 

     @Override 
     protected void publishResults(CharSequence charSequence, FilterResults filterResults) { 
      if (filterResults.count > 0) { 
       notifyDataSetChanged(); 
      } else { 
       notifyDataSetInvalidated(); 
      } 
     } 
    } 
} 

ниже LogCat, где и можно увидеть данные извлекаются в то время как я выбираю назад фрагмент, но не установлен в ListView.

E/Inside: here--------------------------- In view1 
E/Image Thumb: --------------null 
E/Inside: here--------------------------- In view1 
E/Image Thumb: --------------null 
I/TextInputLayout: EditText added is not a TextInputEditText. Please switch to using that class instead. 
E/count: 2 
E/No Image Thumb: -------------- 
E/No Image Thumb: -------------- 
E/count: 2 
E/count: 2 

Answer 1

реализует Фильтруемый в BaseAdapter

public class ContactListAdapter extends BaseAdapter implements Filterable 

и добавить значение:

private Filter filter = new CustomFilter(); 

и создать класс в вашем baseAdapter:

private class CustomFilter extends Filter { 
     @Override 
     protected FilterResults performFiltering(CharSequence constraint) { 
      _data.clear(); 

     if (arraylist != null && constraint != null) { 
      for (int i = 0; i < arraylist.size(); i++) { 
       if (arraylist.get(i).toString().toLowerCase().contains(constraint)) { 
        _data.add(arraylist.get(i)); 
       } 
      } 
     } 

    FilterResults results = new FilterResults(); 
      results.values = _data; 
      results.count = _data.size(); 
      return results; 
     } 

     @Override 
     protected void publishResults(CharSequence constraint, FilterResults results) { 
      if (results.count > 0) { 
       notifyDataSetChanged(); 
      } else { 
       notifyDataSetInvalidated(); 
      } 
     } 
    } 

добавить в классе baseAdapter:

@Override 
public Filter getFilter() { 
    return filter; 
} 

мой адаптер, например:

import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.Filter; 
import android.widget.Filterable; 
import android.widget.TextView; 

import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.List; 

public class CustomArrayAdapter extends BaseAdapter implements Filterable{ 
    private LayoutInflater mInflater; 
    private final Context context; 
    private List<String> mItems; 
    private Filter filter = new CustomFilter(); 
    private ArrayList<String>mItemsSuggestion = new ArrayList<String>(); 

    public CustomArrayAdapter(Context context, String[] values) { 
     this.context = context; 
     mItems = Arrays.asList(values); 
    } 

    @Override 
    public int getCount() { 
     return mItemsSuggestion.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return mItemsSuggestion.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     View oneView = mInflater.inflate(R.layout.towar_list, parent, false); 
     TextView text = (TextView)oneView.findViewById(R.id.towaryAllList); 
     text.setText(mItemsSuggestion.get(position).toString()); 
     return oneView; 
    } 


    @Override 
    public Filter getFilter() { 
     return filter; 
    } 

    private class CustomFilter extends Filter { 
     @Override 
     protected FilterResults performFiltering(CharSequence constraint) { 
      mItemsSuggestion.clear(); 

      if (mItems != null && constraint != null) { 
       for (int i = 0; i < mItems.size(); i++) { 
        if (mItems.get(i).toString().toLowerCase().contains(constraint)) { 
         mItemsSuggestion.add(mItems.get(i)); 
        } 
       } 
      } 
      FilterResults results = new FilterResults(); 
      results.values = mItemsSuggestion; 
      results.count = mItemsSuggestion.size(); 
      return results; 
     } 

     @Override 
     protected void publishResults(CharSequence constraint, FilterResults results) { 
      if (results.count > 0) { 
       notifyDataSetChanged(); 
      } else { 
       notifyDataSetInvalidated(); 
      } 
     } 
    } 
} 

Answer 2

Я решил сейчас. Проблема заключалась только в том, чтобы напрямую размещать код поиска в радиоконтакте в кликах-щелчках, а не непосредственно в методе createview.